Staff Software Engineer, Billing

AIRWALLEX (SINGAPORE) PTE. LTD.; Singapore; Hybrid; SGD 120,000 - 180,000; Full time

Job summary

Airwallex is seeking a seasoned Backend Engineer to own Java-based microservices in a global billing platform. Based in Singapore/Shanghai, you will design scalable components, guide architecture, and collaborate with cross‑functional teams to deliver mission‑critical features.

You will work with Spring Boot, Docker, and distributed systems patterns to optimize performance under high load and help establish coding standards across the team.

Qualifications

• 5+ years in Core Java development and 5+ years in Internet application / large financial system / e-commerce platform development.
• 1+ year experience in payment platform development.
• Bachelor degree in computer science and related majors.
• Proficient in Java 8, familiar with Java multi-threading, high concurrency, IO / NIO, network communication.
• Familiar with common design patterns, and development of large-scale distributed, high concurrency, high load, high availability systems.
• Master various server technologies to optimize service response and data query, ensure service quality, and solve high concurrency issues.
• Familiar with Spring / Spring Boot.
• Familiar with HTTP, TCP / IP and REST specifications.
• Proficient with Gradle / Maven build tools.
• Familiar with the use of Docker cluster.
• Familiar with JSON & XML.

Responsibilities

• Lead the planning, design, and implementation of the Airwallex engineering system.
• Work with business/product teams to understand needs, design architecture, and develop core functions for complex systems.
• Design and develop components within the company's microservice framework.
• Introduce innovative technologies and solutions for the team.
• Build and manage the technical team and establish coding standards.

Skills

Core Java

High concurrency

Large-scale distributed systems

Education

Bachelor degree in computer science or related majors

Tools

Spring Boot

Docker

Gradle/Maven

REST/HTTP

JSON/XML

Kubernetes

Job description

About the team

The Billing Team at Airwallex is at the forefront of transforming how businesses handle pricing, billing, and invoicing. Our mission is to create a seamless, scalable, and transparent billing platform that not only supports Airwallex's growth but also empowers our customers to easily manage their billing needs.

Our team is dedicated to developing a next-generation billing platform designed to offer flexible pricing strategies and intuitive invoicing solutions. This platform aims to be a cornerstone for businesses, enabling them to bill and get paid effortlessly. By integrating cutting-edge technology, we ensure that our solutions are easy to adopt and integrate, providing a robust billing experience for all users.

The engineering team spans across Shanghai and Singapore, offering the chance to collaborate with cross‑functional teams around the world. Engage with various domains such as GTPN, PA, Scale, Issuing, and Spend to automate end‑to‑end pricing and billing processes. The work here is impactful, contributing to building a platform that empowers businesses globally, making a tangible difference in their operations.

What you’ll do

We envision a future where our billing platform not only supports Airwallex internally but also serves as an easy‑to‑integrate product for our customers. By joining our team, you play a crucial role in realizing this vision, working alongside talented professionals to deliver business‑critical features and solutions. Together, we will build the next‑gen billing solution that empowers businesses worldwide.

This role is based in Singapore/Shanghai, China.

Responsibilities:

• 1. Lead the planning, design, and implementation of the Airwallex engineering system;
• 2. Work with the business/product team to deeply understand the business needs, scenarios, and subsequent development directions, complete system analysis, architecture design, and core function development, and be able to grasp the design of complex systems to ensure the quality of complex architecture;
• 3. Design and develop components based on the company's microservice framework;
• 4. Introduce innovative technologies and innovative solutions for the team;
• 5. Responsible for the construction and management of the technical team, and establish good internal coding standards.

Who you are

We're looking for people who meet the minimum qualifications for this role. The preferred qualifications are great to have, but are not mandatory.

Minimum qualifications:

• 1. More than 5 years of Core Java development, more than 5 years of experience in Internet application / large financial system / e‑commerce platform development;
• 2. More than one year experience in payment platform development;
• 3. Bachelor degree in computer science and related majors;
• 4. Proficient in Java 8, familiar with Java multi‑threading, high concurrency, IO / NIO, network communication, etc .;
• 5. Familiar with commonly used design patterns, with experience in design and development of large‑scale distributed, high concurrency, high load, high availability systems;
• 6. Master various common server technologies, which can optimize service response and data query, ensure various service quality, and solve the problems of high concurrency and high availability;
• 7. Familiar with Spring / Spring Boot;
• 8. Familiar with HTTP, TCP / IP protocol and REST specifications;
• 9. Master Gradle / Maven and other build tools;
• 10. Familiar with the use of Docker cluster;
• 11. Familiar with JSON & XML.

Preferred qualifications:

• 1. International clearing and settlement / foreign exchange transactions;
• 2. Fluent in English;
• 3. Cassandra / Redis / NoSQL / Hadoop;
• 4. Kotlin / Scala / Python / Golang / R;
• 5. Docker Swarm / Kubernetes;
• 6. JavaScript / Angular / React / CSS3;
• 7. Aliyun Cloud / AWS.